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允许Qt Webengine调用本地摄像头

收到page的信号强制允许就好了。
这里偷懒允许了所有feature，需要根据需求自定义

        connect(page, &QWebEnginePage::featurePermissionRequested,
                        [this, page](const QUrl &securityOrigin, QWebEnginePage::Feature feature) {
                page->setFeaturePermission(
                                        securityOrigin, feature, QWebEnginePage::PermissionGrantedByUser);
        });

        

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